Bicycle frame



FIG. 1 is a top and right side perspective view of a bicycle frame embodying our new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the bicycle frame that form no part of the claimed design. 

CLAIM We claim the ornamental design for a bicycle frame, as shown and described. 